Make TreeScope::baseURL pure virtual

Source/core/dom/TreeScope.cpp

Index: Source/core/dom/TreeScope.cpp
diff --git a/Source/core/dom/TreeScope.cpp b/Source/core/dom/TreeScope.cpp
index 6bf5ba49941bc47fd422dbe5b1fa525ca4cc5305..92c3629fe783ec26fdc7e4cc10c98bccf0a9a8af 100644
--- a/Source/core/dom/TreeScope.cpp
+++ b/Source/core/dom/TreeScope.cpp
@@ -495,6 +495,13 @@ void TreeScope::setNeedsStyleRecalcForViewportUnits()
     }
 }
 
+const KURL& TreeScope::baseURL() const
+{
+    if (!m_baseURL.isEmpty() || document() == this)

[esprehn, 2014/01/14 00:36:36]

Why not just make this virtual and let document override it?

+        return m_baseURL;
+    return document().baseURL();
+}
+
 KURL TreeScope::completeURL(const String& url) const
 {
     return document().completeURLWithOverride(url, baseURL());